665434788373 has 4 divisors (see below), whose sum is σ = 674807109408. Its totient is φ = 656062467340.

The previous prime is 665434788301. The next prime is 665434788377. The reversal of 665434788373 is 373887434566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665434788373 - 2³⁷ = 527995834901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665434788377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4686160411 + ... + 4686160552.

It is an arithmetic number, because the mean of its divisors is an integer number (168701777352).

Almost surely, 2^665434788373 is an apocalyptic number.

It is an amenable number.

665434788373 is a deficient number, since it is larger than the sum of its proper divisors (9372321035).

665434788373 is an equidigital number, since it uses as much as digits as its factorization.

665434788373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9372321034.

The product of its digits is 243855360, while the sum is 64.

The spelling of 665434788373 in words is "six hundred sixty-five billion, four hundred thirty-four million, seven hundred eighty-eight thousand, three hundred seventy-three".